1. Muscles must have at least two attachments and must cross at least one joint.
2. Muscles always “pull” and get shorter.
3. The attachment that moves is known as the insertion and the attachment that remains stationary is known as the origin.
4. Muscles that decrease the angle between ventral surfaces of the body are known as flexors. Muscles that increase the angle between ventral surfaces of the body are known as extensors
5. Muscles work in opposing pairs.
6. Muscle striations point to the attachments and show the direction of pull.
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